CL level gcur commands are incomplete. We plan to add more, though it is unclear if we will ever implement the full set of commands. (planned)

The image display cannot be used for interactive plotting. (Note that it can already be used for noninteractive plots.) (work in progress)

There is limited graphics support for terminal-type devices such as xgterm and xterm. (no definite plans, but we may add support for interactive use of some terminals if demand warrants it)

A few graphics functions are not implemented (e.g., PUTCELLARRAY which is used to put an image in the graphics window.) (tentatively planned, but low priority)

We plan to make more of the current gcur capabilities (zooming, etc.) accessible through GUI mechanisms --- menus, buttons, etc. --- as well as (or instead of) through the traditional keystroke commands.